AnyThread

Denotes that the annotated method can be called from any thread (e.g. it is "thread safe".)
If the annotated element is a class, then all methods in the class can be called
from any thread.

The main purpose of this method is to indicate that you believe a method can be called
from any thread; static tools can then check that nothing you call from within this method
or class have more strict threading requirements.